This is Frontier Design Group's TranzPort. Use this device to toggle through your tracks, adjust volume, pan, EQ, etc. Arming tracks, muting and soloing tracks, creating markers, and setting loop points are all possible - with visual feedback via the LCD screen. The drivers are old on the Frontier website, however, the Windows driver installs on Windows 10/11 using compatibility mode (Windows 7). I haven't had any problems with the functioning of the driver under Windows 10. For Mac users, a newer driver from Synclavier can be obtained to extend the life of the device on macOS 10.14 to macOS 11. You could even use Rosetta 2 with the newest macOS. You get the TranzPort device, the RF receiver, and a mic stand adapter. The Tranzport device requires 4 AA batteries.